
main () {
  String  username = "老高";

  String  age = "34岁";

  print("$username  今年 $age");

  username = "小高";

  int strLengh = username.length;


  String poetry = '''
   白日依山尽
   黄河入海流
   欲穷千里目
   更上一层楼
   $strLengh
 ''';
  print(poetry);
}